Poberezhnyi, V. I., Marchuk, O. V., Shvidyuk, O. S. and Petrik, I. Y. (2018) “Fundamentals of the modern theory of the phenomenon of ‘pain’ in terms of a systematic approach to issues its psychological component. Terminology of the systemic approach and a brief representation of the human body as a system”, Pain medicine, 3(2), pp. 6-23. doi: 10.31636/pmjua.v3i2.97.